1. Florent IV, Count of Holland and Zeeland was born in 1210. He married Matilda of BRABANT.
Matilda of BRABANT, daughter of Henry II, Duke of Brabant (1189-1267) and Marie of Swabia (1207-1239), was born circa 1225. She died on 29 September 1288. She and Florent IV, Count of Holland and Zeeland had the following children:
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2. Adelaide of Holland, daughter of Florent IV, Count of Holland and Zeeland and Matilda of BRABANT, married Jean I d'Avesne.
Jean I d'Avesne, son of Archdeacon Bouchard d'Avesnes (1180-1244) and Margaret of Hainault (1202-1280), was born in 1218. He died in 1257. He and Adelaide of Holland had the following children:
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3. Jean II d'Avesne, son of Jean I d'Avesne and Adelaide of Holland, was born in 1247. He married Philippa of Luxumbourg.
Philippa of Luxumbourg and Jean II d'Avesne had the following children:
| 4 | William, Count of Holland and Hainault (1286- ). William, was born in 1286. |